Sound box



May 15, 1923.

(0. F. SNYDER SOUND BOX Filed May 5, 1920 9 @2120 toe Iv/l/l/l/A L3 75,; awe m1 c 1 Patented May 15, 1923.

UNITED STATES PATENT OFFICE.

DANIEL F. SNYDER, OF GARWOOD, NElV JERSEY, ASSIG'NOR TO THE AEOLIAN COM- PANY, A. CORPORATION OF CONNECTICUT.

SOUND BOX.

Application filed May 5, 1920.

T all whom it may concern Be it known that I, DANIEL F. SNYDER,

a citizen of the United States, and a resident of Garwood, county of Union, and State of New Jersey, have invented certain new and useful Improvements in Sound Boxes, of which the following is a specification.

This invention relates to mechanism for modifying the efiect of the diaphragm and in particular, to controlling the effective area of the diaphragm.

The objects of the invention are to pro vide simple, practical and efiicient mechanism of the character stated.

The invention involves certain novel features of construction, combinations and arrangements of parts, as will be hereinafter set forth.

In the drawing accompanying and forming a part of this specification I have illustrated the invention embodied in one of its simple, commercial forms, but wish it understood that modifications and changes may be made without departure from the true spirit and scope of the invention.

In the drawing referred to, Figure 1 is a front or "face view of my improved sound box.

Figure 2 is a sectional view of the same on substantially the plane of line 2-2 of Figure 1. In both the views referred to the parts are adjusted to utilize the full expanse of the diaphragm.

Figures 3 and 4c are views similar to Figures 1 and 2. showing the parts adjusted to reduce the efi'ective area of the diaphragm.

The sound box illustrated consists of a base part 5 and a cover part 6 between which the diaphragm 7 is clamped at its rim by means ot the usual gaskets 8.

The diaphragm-controlling devices are shown in the form of rings 9 and 10 ad justably supported in the sound box at opposite sides of the diaphragm and carrying gaskets 11, 1.2 for engagement with the opposite faces of the diaphragm. These gaskets are shown as of equal diameter and as disposed concentrically so as to grip the diaphragm at directly opposite points.

The gasket members described are both shifted either toward or away from the diaphragm by mounting them on reversely screw-threaded seats in the sound box and Serial No. 379,008.

by connecting them so that they may be turned in unison. For these purposes the base member 5 is shown formed with a screw-threaded seat 13 and the ring 9 is shown as internally screw-threaded to engage said seat. while the cover 6 is shown as formed with a reversely screw-threaded seat 14 with which the correspondingly threaded outer peripheral portion of the ring 10 is engaged.

The two rings are coupled together by a handle lever in the form of a bridge arched about the rim of the sound box and consisting of the radially projecting arms 15 and '16 secured to the rings 9 and 10 and having a sliding telescopic jointat their outer ends, as indicated at 17 From the foregoing it will be apparent that by turning the handle described, the rings will be simultaneously rotated in one direction or the other and will, by their reversely screw-threaded connections with the sound box, be both either advanced toward or carried away from the interposed diaphragm. When these adjustable gasket members are brought into engagement with the diaphragm it will be seen that the ef 'Fective area of the diaphragm will be reduced and consequently, the vibratory action of the diaphragm will be modified. These adjustments may even be made while the sound box is in operation, so that the eflect may be observed and the desired results obtained with certainty.

lVhat 1' claim is 1. The combination with a sound box and a diaphragm mounted therein, of diaphragm engaging rings at opposite sides of the diaphragm and having reversely screwthreaded mountings in the sound box whereby rotation of said rings in one direction will carry the same toward the diaphragm and rotation in the opposite direction will carry them away from the diaphragm and means connecting the rings for rotating both the rings concurrently in one direction or the other.

2. The combination with a sound box and a diaphragm mounted therein, of diaphragm engaging rings at opposite sides of the diaphragm and having reversely screwthreaded mountings in the sound box whereby rotation of said rings in one direction will carry the same toward the diaphragm and rotation in the opposite direction will carry them away from the diaphragm and means for rotating both the rings in one direction or the other, including a bridge about the rim of the sound-box and expansible and contractable with the movements of the rings in opposite directions.

3. The combination with a sound box and a diaphragm mounted therein, of diaphragm engaging rings at opposite sides of the dia phragm and having reversely'screwthreaded mountings in the sound box whereby rotation of said rings in one direction will carry the same toward the diaphragm and rotation in the opposite direction will carry them away from the diaphragm and means for rotating both the rings in one direction or the other, including telescopically engaged members connected with the two rings.

4. The combination with a sound boxand a diaphragm mounted therein, of diaphragm engaging gasket members rotatably mounted in the sound box at opposite sides of said diaphragm and having means operative by rotation of said members to more the latter to and from engagement with the diaphragn'i and means for rotating said members concurrently in the same direction to move them either toward or away from the diaphragm.

5. The combination with a sound box and a diaphragm mounted therein, of gasket members of substantially the same diameter having relatively reverse screw thread engagen'ients with the sound box and located at opposite sides of the diaphragm and means for concurrently rotating both said members in the same direction to move them either toward or away from the diaphragm.

6. The combination with a sound box and a diaphragm mounted therein, of gasket members of substantially the same diameter adjustably supported at opposite sides of the diaphragm, means for shifting both said members either toward or away from the diaphragm, including reversely screwthreaded mountings for said members in the sound box and an expansible and contractable connection between the members for simultaneously rotating the same to carry them both toward or away from the diaphragm.

7. The combination with a sound box and a diaphragm mounted therein, of reversely screw-threaded rings mounted in the sound box to move to and from engagement with the respective opposite sides of the diaphragm, one of said rings having the screwthreaded portion at the inner periphery thereof and the other ring having the screwthreaded portion on the outer periphery thereof.

In witness whereof, I have hereunto set my hand this 27th day of April, 1920.

DANIEL F. SNYDER. 

